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If you were to log on to the
manufacturer's web site, I think you will be pleasantly surprised as
usually one is able to download, by model number, Customer
Instruction Manuals, list
of Dealers for spare part supplies and
Driver
downloads
(if applicable)as required.

In most motherboards CMOS battery is soldered, which makes it
difficult to remove the battery. In this case we use another method.

Almost all motherboards contain a jumper that can clear all CMOS
settings along with the BIOS password. The location of this jumper
varies depending upon the motherboard brand. You should read your
motherboard manual to check its location. If you don't have the manual
then look for the jumpers near the CMOS battery. Most of the
manufacturer label the jumper as CLR, CLEAR, CLEAR CMOS, etc.

When you find the jumper, look carefully. There will be 3 pins and
the jumper will be joining the center pin to either left or right pin.
What you need to do, is remove the jumper and join the center pin to
the opposite pin. e.g. if the jumper joins center pin to left pin, then
remove it and join center pin to right pin. Now wait for a few seconds
and then again remove the jumper and join the center pin to left pin.

Make sure to turn the PC off before opening the cabinet and resetting the jumper.